706
Q:

A student multiplied a number by 3/5 instead of 5/3, What is the percentage error in the calculation ?

A) 54 % B) 64 %
C) 74 % D) 84 %

Answer:   B) 64 %



Explanation:

Let the number be x.

Then, ideally he should have multiplied by  x by 5/3. Hence Correct result was x * (5/3)= 5x/3. 

 

By mistake he multiplied x by 3/5 . Hence the result with error  = 3x/5 

Then, error = (5x/3 - 3x/5) = 16x/15 

Error %  = (error/True vaue) * 100 = [(16/15) * x/(5/3) * x] * 100 = 64 %

Q:

After buying a toy for Rs.45, Raghu managed to sell it at a profit of 15%. The selling price of the toy was

A) Rs. 50.75 B) Rs. 60
C) Rs. 51.25 D) Rs. 51.75
 
Answer & Explanation Answer: D) Rs. 51.75

Explanation:
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2 61
Q:

The arithmetic mean of the marks scored by students of a class is 58. 20% of them secured a mean score of 60. The mean score of another 30% of the students was 40. The mean score of the remaining students is

A) 65 B) 66
C) 68 D) 70
 
Answer & Explanation Answer: C) 68

Explanation:
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5 147
Q:

The marked price of a book is Rs 4200. The shopkeeper gives two successive discounts of 25% and y% to the customer. If the customer pays Rs 2898 for the book, then what is the value (in percentage) of y?

 

A) 7 B) 8
C) 6 D) 5
 
Answer & Explanation Answer: B) 8

Explanation:
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1 208
Q:

Weight of Ayush and Abhishek are in the ratio of 6:11. Abhishek's weight increases by 25% and total weight of Ayush and Abhishek both increases by 40%. If total weight becomes 119 kg, then wat is the weight (in kg) of Ayush after the increment?

A) 45.5 B) 30
C) 50.25 D) 47.75
 
Answer & Explanation Answer: C) 50.25

Explanation:
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1 168
Q:

Jalal, Amit and Feroz enter into partnership. Jalal invests 4 times as much as Amit and Amit invests three-fourth of what Feroz invests. At the end of the financial year, the total profit earned is Rs. 19,000. Find the share for Jalal.

A) Rs. 15000 B) Rs. 12000
C) Rs. 13000 D) Rs. 10000
 
Answer & Explanation Answer: B) Rs. 12000

Explanation:
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1 413
Q:

Two successive discounts of 10% and 25% are given by Raman on a shirt. If the marked price of the shirt is Rs 600, then what is the value (in Rs) of discount?

 

A) 195   B) 185  
C) 155   D) 135
 
Answer & Explanation Answer: A) 195  

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4 417
Q:

Out of two numbers, 65% of the smaller number is equal to 45% of the larger number. If the sum of the numbers is 2574, then what is the value of larger number?.

 

A) 1521   B) 1471  
C) 1641   D) 1419
 
Answer & Explanation Answer: A) 1521  

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2 373
Q:

Read the data given below and answer the questions based on it.

 

In the CBSE Board exams last year, 53% passed in Biology, 61% percent passed in English, 60% in Social studies, 24% in Biology and English, 35% in English and social studies, 27% in Biology and social studies and 5% in none.

 

What is the ratio of percentage of students who passed in Biology and Social Studies but not English in relation to the percentage of students who passed in Social Studies and English but not Biology?

A) 5:7 B) 7:5
C) 4:5 D) 5:4
 
Answer & Explanation Answer: A) 5:7

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2 652